/ Slacklining Movable Ground Anchors

I am a youth worker delivering sport across somerset and have just manage to get the boss to authorize me to deliver slacklining sessions.
For obvious reasons i wont always have appropriate trees to use as anchors so was just wondering if people had used the screw-in ground anchors and A frames, if so how effective they have been and also somewhere to buy them at a reasonable price. (as i don't have the money in my delivery budget to buy two @ £50+ each...)
at the moment i have a gibbon classic 25m and would just like some feedback on the anchors?

I should really be recommending that you visit our shop and buy some from us... But since you've mentioned you're on a budget, check out somewhere like Machine Mart for ground anchors. I've seen that they have a similar thing pretty cheap. You'd have to check what they were rated to, but the concept is pretty much the same.

Make sure you have a steel bar about 1m long to place/remove them.

Not sure about A-frames though, I think it would be possible to make some similar to the ones from Slackline Tools.